Carrier route record
ASSEA→FLL
Alaska Airlines · Seattle to Fort Lauderdale
- Flights
- 462
- Period
- September 2025 to August 2026
- Share of route
- 56%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on SEA to FLL lands a B+, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That rests on 462 flights, with a median arrival 9 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Alaska on SEA to FLL from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
81.1%
Arrivals under 15 minutes late, of 460 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
0.22%
National rate is 1.89%
Whole route
78.6%
Every carrier on SEA to FLL, 826 flights
These figures cover 462 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Alaska against every carrier on SEA to FLL
Alaska flew 462 of the 826 flights on SEA to FLL, most of the route. Its 81.1% on time is 3 points better than the route as a whole, which runs 78.6%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Alaska at 81.1% to Delta at 75.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Alaska Airlines (this page) | 462 | 81.1% | 44 min | 0.22% | B+ |
| Delta Air Linesthin sample | 364 | 75.3% | 47 min | 1.37% | B |
Flight by flight
Alaska flight numbers on SEA to FLL
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Alaska runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am365 flights83.5%
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am97 flights72.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 83.5% of the time, against 72.2% for the overnight window. That is 11 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 365 flights scheduled in it.
Across the year
Alaska on SEA to FLL through the year
December is the weak month at 67.7% on time, against 93.5% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. December was the busiest month here, with 62 flights.
Across the week, Wednesday is the strongest day at 93.5% on time and Friday the weakest at 72.5%, a spread of 21 points.
Arrival by arrival
How late Alaska on SEA to FLL runs when it is late
Alaska on SEA to FLL often beats the schedule: 168 of 460 completed flights, 37%, arrived 15 minutes or more early. The 87 late arrivals split 43 under half an hour, 28 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early168 flights36.5%
- Within 15 min205 flights44.6%
- 15–29 min late43 flights9.3%
- 30–59 min late28 flights6.1%
- 1–2 hours late12 flights2.6%
- 2+ hours late4 flights0.9%
Scale runs 0% to 100%.
Share of 460 completed flights by arrival against schedule.
A late pushback is often recovered here: of 79 departures that left 15 minutes late or more, 33 still arrived on time. In the other direction, 41 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at FLL.
The worst days
Worst days for Alaska on SEA to FLL
The latest arrival of the period was on 15 January 2026, 4 hours 5 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 January 2026 | 4 hours 5 minutes | Carrier |
| 12 February 2026 | 3 hours 30 minutes | Late-arriving aircraft |
| 16 October 2025 | 2 hours 33 minutes | Carrier |
| 6 March 2026 | 2 hours 1 minute | Carrier |
| 9 November 2025 | 1 hour 59 minutes | Carrier |
Delay causes
Why Alaska runs late on this route
National Airspace System accounts for 46% of the 3,822 delay minutes carriers reported here, and the remaining four split what is left.
- 46%National Airspace System
- 39%Carrier
- 14%Late-arriving aircraft
- 1%Extreme weather
46% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,758 minutes out of 3,822, against a national NAS share of 21%. The split is drawn from 3,822 reported delay minutes.
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,488 of the 3,822 delay minutes reported here.
Cancellations are rare at 0.22%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.5% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 2,717 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 68.4% on time across 462 flights, 13 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 13 points of difference.
One caution: this is a thin sample. 462 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Alaska on SEA to FLL
Put together: treat all of this as provisional. 462 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 81.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 460 completed flights over 12 months sit behind that.
Related
Where to go next
- SEA to FLL, every carrier
- Alaska on FLL to SEA, the return leg
- Delta Air Lines on SEA to FLL75.3%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.